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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ab4ebcea1f424648d50121288bd6d256ce14476b8e115878491c36ac27e249' 
  AND token = 'EtHMcSepFnSsToB4FcyV7SbAkR1mS6r6HXhCfXbcraY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}